### Circular Motion, Angular Variables, Angular Velocity, Angular Acceleration, Application of Newton’s Laws of Motion.

At Nokryan.com, you can delve into the captivating realm of circular motion and angular variables, where lucidity and profound insights intersect harmoniously. Commencing with “Circular Motion,” we embark on an exploration of the intriguing occurrence of objects traversing curved paths, establishing the basis for further investigation. Seamlessly transitioning to “Angular Variables,” we unravel the fundamental parameters utilized to depict rotational motion, furnishing a comprehensive framework for scrutiny. Subsequently, we delve into “Angular Velocity,” elucidating the measure of change in angular displacement and its importance in comprehending rotational dynamics, enhancing our comprehension of the cosmos. All this and more awaits at Nokryan.com.

1. When a body moves in a circle in the clockwise direction the angular displacement ∆Ѳ is taken as?

- Positive
- Negative
**correct** - Both ways
- None of these

2. S.I. unit of angular velocity is

- Degree per second
- Revolution per minute
- Radian per second
**correct** - None of these

3. The rate at a which the angular displacement is changing with time is called?

- Average angular velocity
- Angular acceleration
- None of these
- Angular velocity
**correct**

4. As the ∆t approaches to zero, the limit of ratio ∆ω/∆t becomes

- Variable angular acceleration
- Instantaneous angular acceleration instantaneous
**correct** - None of these
- Average acceleration

5. Angular displacement is a vector quantity for?

- All values of ∆Ѳ
- Very small value of ∆Ѳ
**correct** - None of these
- Small value of ∆Ѳ

6. One radian is equal to

- 58⁰
- 57.3⁰
**correct** - 57⁰
- 360⁰/π

7. The S.I. unit of angular displacement is

- Degrees
- Revolution
- Radian
**correct** - All of these

8. I revolution is equal to

- None of these
- 2π radian
- 360⁰
- Both
**correct**

9. ‘S’ is the are length and after one revolution it becomes

- 2πr
**correct** - 2 π
- None of these
- 2π/r

10. Angular displacement generally expressed in

- Revolution
- Degrees
- Radian
- All of these
**correct**

11. The rate of change of angular velocity is called

- Angular displacement
- Angular acceleration
**correct** - Instantaneous velocity
- None of these

12. Angle subtended at the center of the circle by a body is called?

- All of these
- Linear velocity
- Angular velocity
- Angular displacement
**correct**

13. *2*π radian is equal to the degrees

- None of these
- 360⁰
**correct** - 90⁰
- 180⁰

14. Radian is the unit of angular displacement which is?

- Greater than degree
**correct** - None of these
- Equal
- Less than degree

15. The direction of angular acceleration is

- Opposite to the axis of rotation
- Along the axis of rotation
**correct** - Perpendicular to the axis of rotation
- None of these

16. When a body moves in a circle in the counter clockwise direction the angular displacement ∆Ѳ is taken as?

- None of these
- Negative
- Both ways
- Positive
**correct**

17. The direction of angular displacement is determined by using

- None of these
- Head-to-tail rule
- Right angle rule
**correct** - Fleming left hand rule

18. Angular velocity is a

- Scalar quantity
- Constant quantity
- None of these
- Vector quantity
**correct**

19. What is the relation between an are length and the angle Ѳ (in radian) with the ‘r’ as its radius

- S = r Ѳ
**correct** - None of these
- Ѳ = r/S
- R = Ѳ/S

20. Angular acceleration is a

- Scalar quantity
- Vector quantity
**correct** - Variable quantity
- None of these

**Entry Test 2021 Physics Circular Motion MCQS Online Preparation Sample Paper 2 Questions with Answer**

1. The rotational analogue of Newton’s second law of motion is

- None of these
- mrα²
- mr²α
**correct** - mrα

2. The relation between linear acceleration and angular acceleration is

- a=ωr/α
- a = rωα
- a=r/ω α
- at=rα
**correct**

3. The law of conservation is important in many sport like

- Diving
- All of these
**correct** - Ice-skating
- Gymnastics

4. The axis of ration of an object will not change its orientation unless

- None of these
- Internal torque acts in one direction
- Internal torque acts
- External torque acts
**correct**

5. The linear velocity in a circle is called

- Linear velocity
- None of these
- Angular velocity
- Tangential velocity
**correct**

6. An electric fan rotating in 3 revs¯¹ is switched off. It come sot rest in 18.0 sec. Find the value of acceleration which is

- 0027 revs¯²
- – 0.167 revs¯²
**correct** - + 1.267 revs¯²
- – 0.152 revs¯²

7. The force required to bend the normally straight path of the particle into circular path is called

- Centripetal force
**correct** - Normal force
- Applied force
- Reactional force

8. The Earth’s axis of rotation is

- Not fixed
- Remains fixed in one direction
**correct** - None of these
- Remains fixed

9. The equations of angular motion only hold true when the axis of rotation is

- Fixed in some equations
- Not fixed

None of these- Fixed
**correct**

10. The moment of inertia plays the same role in angular motion as in linear motion as

- Density
- Mass
**correct** - None of these
- Weight

Question was not answered11. The units of angular acceleration is

- None of these
- Radian per second
- Radian
- Radian per minute
**correct**

12. In the relations ∆S/∆t =r ∆Ѳ/∆t. If he limit is taken as ∆t → 0 then relation takes the form

- v = r/ω
- V = rω
**correct** - a = rV
- a = rω

13. On the circumference of a circle, the magnitude V is very small and has direction

- Perpendicular to the point
- None of these
- Changes from time to time
- Along he tangent to the circle
**correct**

14. In a uniform circular motion of a particle, the direction changes but not its

- B and C
**correct** - Angular displacement
- Force towards center
- Magnitude of velocity

15. All points on a rigid body rotating about a fixed axis have

- Same angular acceleration
- Don’t have angular speed
**correct** - None of these
- Same angular displacement

16. A 10 kg car is turning around a corner at 10ms¯¹. The radius of the circular are is 10m. Find the force between the types and pavement which is

- 1.0 x 10⁴ N
**correct** - 1.0 x 10⁶ N
- 1.0 x 10² N
- None of these

17. In the relation ∆S/∆t = r ∆Ѳ/∆t. If the limit is taken as ∆t → 0 time ∆S/∆t represents

- Linear velocity
**correct** - Angular velocity
- Linear acceleration
- None of these

18. By the use of angular variable we can describe the

- Angular motion of a body
**correct** - None of these
- Linear motion of body
- Both

19. The centripetal force in terms of its angular measure is given by

- Fc = mrω²
**correct** - Fc = mr²ω
- None of these
- Fc = mr²ω²

20. The quantity mr² is known as

- Moment arm
- Moment of inertia
**correct** - None of these
- Moment of force

**Entry Test 2021 Physics Circular Motion MCQS Online Preparation Sample Paper 3 Questions with Answer**

1. If the particle is moving in a circle of radius ‘r’ with uniform angular velocity ω. The angle between r and tangential velocity is

- 0⁰
- 180⁰
- 270⁰
- 90⁰
**correct**

2. For an elliptic orbit, the satellite has speed of

- None of these
- 35,000 Kmh¯¹
- 37,000 Kmh¯¹
- 30,0000 Kmh¯¹
**correct**

3. Moment of inertia of a thin ring or hoop is

- 2/3 mr²
- 1/3 mr²
- mr²
**correct** - 5/6 mr²

4. Moment of inertia of a solid disc or cylinder is

- ½ mr²
**correct** - mr²
- ¼ mr²
- 1/3 mr²

5. Moment of inertia of thin rod is

- 1/15mL²
- 1/2mL²
- 1/12mL²
**correct** - 1/6mL²

6. The angular momentum is a vector quantity with due

- Perpendicular to the axis of rotation
- Along the axis of rotation
**correct** - At the axis of rotation
- None of these

7. The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

- None of these
- Frictional force action it
- Torque acts on it
**correct** - Force acts on it

8. The angular momentum of a particle is given as

- L = p x V

None of these- L = m x p
- L = r x p
**correct**

9. Law of conservation of momentum has been verified for the

- A and C
**correct** - Submicroscopic level
- Cosmological level
- Microscopic level

10. Moment of inertia of a sphere is

- 2/5 mr²correct
- 1/3 mr²
- 4/5 mr²
- ¾ mr²

11. For a circular orbit, the satellite has speed of

- 26,000 Kmh¯¹
- 20,00 Kmh¯¹
- 25,000 Kmh¯¹
- 27,000 Kmh¯¹
**correct**

12. The orbital radius as the revolving body is revolving is

- Smaller
- Very Smaller
- Larger
**correct** - None of these

13. The spin angular momentum is the angular momentum of a

- Rotating body
- None of these
- Revolving body
- Spiming boy
**correct**

14. Moment of inertia depends on mass and also on

- r³
- r
- r²
**correct** - None of these

15. SI unit of angular momentum is

- Kgms¯¹
- Kgm³s¯¹
- Kgm²s¯²
- Kgm²s¯¹
**correct**

16. A disc roll down a hill of 10.0 m from rest without slipping. What is its speed at the bottom

- 11.3 ms¯¹
- 11.4 ms¯¹
**correct** - 10.2ms¯¹
- None of these

17. Satellites are objects that orbit around the

- Planet
- Sun
- All of these
- Earth
**correct**

18. Satellites are held in orbits by gravitational pull by Earth and are putt into orbit by

- None of these
- Initial velocity
- Escape velocity
- Rockets
**correct**

19. The mass distribution of a rigid body is

- Not uniform
**correct** - Both
- None of these
- Uniform

20. The orbital angular momentum is associated with the motion of a body

- Along a circular path
**correct** - None of these
- Rotating body
- Revolving body